Lecture 10

Lecture 10 - Bandpass Signaling Bandpass Signaling The...

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Bandpass Signaling
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Bandpass Signaling The bandpass communication signal is obtained by modulating a baseband analog or digital signal. We will use complex envelopes because with them we can represent any type of banppass signal. Definitions: Baseband, Bandpass, and Modulation DEFINITION. A baseband waveform has a spectral magnitude that is nonzero for frequencies in the vicinity of the origin (i.e., f = 0) and negligible elsewhere. DEFINITION. A bandpass waveform has a spectral magnitude that is nonzero for frequencies in some band concentrated about a frequency c f f ± = where c f . > 0. The spectral magnitude is negligible elsewhere. c f is called the carrier frequency. DEFINITION. Modulation is the process of imparting the source information onto a bandpass signal with a carrier frequency c f by the introduction of amplitude or phase perturbations or both. This bandpass signal is called the modulated signal s(t), and the baseband source signal is called the modulating signal m(t).
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Lecture 10 - Bandpass Signaling Bandpass Signaling The...

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